# Keycloak 26.3.0/26.3.1 fails to start: Liquibase driver broken

## What's going on

Keycloak 26.3.0 (and 26.3.1) failed to start with Liquibase/database driver errors during migration, e.g. the changelog lock or driver initialization blowing up at boot. The regression was introduced in the 26.3.0 release's dependency set and hit users on upgrade regardless of their database. The failure happened at boot during migration, before Keycloak could serve any traffic.

## The verified fix

This was a regression in Keycloak 26.3.0 and 26.3.1; upgrade to 26.3.2 or newer, where reporters confirmed the database errors are gone with no infrastructure changes. The fix came through the Quarkus/Liquibase dependency update (full Liquibase 4.33 support landed in 26.4). Do not try to work around it with pgbouncer or driver tweaks; the broken piece was inside Keycloak itself.
Source: https://github.com/keycloak/keycloak/issues/40934

## How to use this

Take the question above and check if it matches what you're seeing. If it does, work through the verified fix step by step. Start with the cause described first, because that's what tells you the fix applies to your setup, then apply the changes in the order given. Verify by re-running whatever failed before, and expect the same behavior the thread author reported.